问题
单项选择题
便携式硫化氢监测仪报警第三级报警应设在危险临界浓度（）。
A、50mg／m3
B、150mg／m3
C、100mg／m3
D、25mg／m3
答案
参考答案：B
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便携式硫化氢监测仪报警第三级报警应设在危险临界浓度（）。
A、50mg／m3
B、150mg／m3
C、100mg／m3
D、25mg／m3
参考答案：B
Tom is the son of a farm owner. One New Year’s Day, when he was 15 ,his father 16 him to work on the farm for one year when he was free. Tom was 17 with his father’s idea. “That isn't my job. I have 18 school work to do. ” Hearing this, his father said, “I promise (许诺) to give you the best present(礼物） if you 19 finish one year’s work. ” Tom thought for a while and 20 . Starting one Saturday, the boy got up early and worked 21 until evening, just like any other farmer. Time passed quickly. Tom’s crops (庄稼) grew well. 22 the last day of the year, the father said, “I’m happy to see that you have worked very hard the whole year. Now, tell me 23 you want. ” The boy smiled and showed his father a big piece of bread made from his wheat(小麦). “I’ve already got the 24 present. No pains, no gains（不劳无获）. I think this is what you wanted 25 to know. ” His father was quite pleased to hear that.
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